 #define _CRT_SECURE_NO_WARNINGS 1
#include<stdio.h>
int main()
{
	int n = 0;
	/*scanf("%d", &n);*/
	int i = 0;
	int ret = 1;
	int  sum = 0;
	for (n = 1; n <= 10; n++)
	{
		for (i = 1; i <= n; i++)
		{
			ret *= i;

		}
		sum += ret;

	}
	printf("%d\n", sum);
	return 0;
}